# Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions

Abstract : Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the \phi\pi(+/-) decay mode in a data sample of 1.0/fb collected with the LHCb detector. The difference between \pi+ and \pi- detection efficiencies is determined using the ratios of fully reconstructed to partially reconstructed D*(+/-) decays. The overall production asymmetry in the Ds rapidity region 2.0 to 4.5 with transverse momentum larger than 2 GeV is measured to be A_P=(-0.33 +/- 0.22 +/- 0.10)%. This result can constrain models of heavy flavour production.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00697158
Contributor : Claudine Bombar <>
Submitted on : Monday, May 14, 2012 - 4:27:47 PM
Last modification on : Monday, July 26, 2021 - 4:12:02 PM

### Citation

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, et al.. Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions. Physics Letters B, Elsevier, 2012, 713, pp.186-195. ⟨10.1016/j.physletb.2012.06.001⟩. ⟨in2p3-00697158⟩

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